Rivet analyses referenceDM1_1980_I140174Cross section for $e^+e^-\to\pi^+\pi^-\pi^0$ at energies between 0.75 and 1.1 GeV.Experiment: DM1 (ACO) Inspire ID: 140174 Status: VALIDATED Authors:
Beam energies: (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.4, 0.4); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5) GeV Run details:
Measurement of the cross section for $e^+e^-\to\pi^+\pi^-\pi^0$ at energies between 0.75 and 1.1 GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples. Source code: DM1_1980_I140174.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FinalState.hh"
4#include "Rivet/Projections/UnstableParticles.hh"
5
6namespace Rivet {
7
8
9 /// @brief e+ e- > pi+ pi- pi0
10 class DM1_1980_I140174 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1980_I140174);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // Initialise and register projections
23 declare(FinalState(), "FS");
24 declare(UnstableParticles(), "UFS");
25 book(_n3pi, 1, 1, 1);
26 for (const string& en : _n3pi.binning().edges<0>()) {
27 double end = std::stod(en)*MeV;
28 if(isCompatibleWithSqrtS(end)) {
29 _ecms = en;
30 break;
31 }
32 }
33 if(_ecms.empty()) MSG_ERROR("Beam energy incompatible with analysis.");
34 }
35
36
37 /// Perform the per-event analysis
38 void analyze(const Event& event) {
39 const FinalState& fs = apply<FinalState>(event, "FS");
40
41 map<long,int> nCount;
42 int ntotal(0);
43 for (const Particle& p : fs.particles()) {
44 nCount[p.pid()] += 1;
45 ++ntotal;
46 }
47 if(ntotal==3 && nCount[211] == 1 && nCount[-211] == 1 && nCount[111] == 1)
48 _n3pi->fill(_ecms);
49 }
50
51
52 /// Normalise histograms etc., after the run
53 void finalize() {
54 scale(_n3pi, crossSection()/ sumOfWeights() /nanobarn);
55 }
56
57 /// @}
58
59
60 /// @name Histograms
61 /// @{
62 BinnedHistoPtr<string> _n3pi;
63 string _ecms;
64 /// @}
65
66
67 };
68
69
70 RIVET_DECLARE_PLUGIN(DM1_1980_I140174);
71
72
73}
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